fix(ssa): Use accurate type during SSA AsSlice simplficiation #5170

Job	Run time
build-noir-wasm	3m 47s
build-nargo	2m 24s
build-acvm-js	2m 17s
build-noirc-abi	2m 32s
ACVM JS (Browser)	1m 16s
ACVM JS (Node.js)	35s
noir_codegen	58s
noir-js-backend-barretenberg	42s
noirc_abi	43s
Noir JS	1m 25s
Integration Tests (Browser)	5m 11s
Integration Tests (Node)	3m 53s
noir_wasm	1m 6s
End	1s
	26m 50s

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